John not quite - as far as our oxide and ur present suppliers. their's - as u have stated - etches back to a brown oxide - or red - depending on original oxide deposit. ours chemically changes the cystalline structure - actually - reducing the needle like structure regards richard fudalewski atotech canada ltd ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################